EP0053559B1 - Verteilungseinrichtung, insbesondere für eine Servolenkungsanlage - Google Patents

Verteilungseinrichtung, insbesondere für eine Servolenkungsanlage Download PDF

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Publication number
EP0053559B1
EP0053559B1 EP81401887A EP81401887A EP0053559B1 EP 0053559 B1 EP0053559 B1 EP 0053559B1 EP 81401887 A EP81401887 A EP 81401887A EP 81401887 A EP81401887 A EP 81401887A EP 0053559 B1 EP0053559 B1 EP 0053559B1
Authority
EP
European Patent Office
Prior art keywords
passages
distribution
fluid
branch
grooves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81401887A
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English (en)
French (fr)
Other versions
EP0053559A1 (de
Inventor
Gilbert Kervagoret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cessione sfd
Original Assignee
DBA SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DBA SA filed Critical DBA SA
Publication of EP0053559A1 publication Critical patent/EP0053559A1/de
Application granted granted Critical
Publication of EP0053559B1 publication Critical patent/EP0053559B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
    • B62D5/083—Rotary valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86638—Rotary valve
    • Y10T137/86646—Plug type
    • Y10T137/86654—For plural lines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86638—Rotary valve
    • Y10T137/86646—Plug type
    • Y10T137/86662—Axial and radial flow

Definitions

  • the invention relates to a distribution device for hydraulic servomechanism and in particular a distribution valve for a power steering system of a motor vehicle, the distribution structure of which is extremely simple from the manufacturing point of view.
  • a distribution device for a servo-mechanism comprising two fluid distribution elements, cylindrical, coaxial, capable of limited relative rotation about their common axis and comprising openings and cavities defining a fluid circulation circuit between a fluid source and a fluid reservoir.
  • the fluid circulation circuit is defined by the cooperation of longitudinal grooves made in the external cylindrical surface of the internal distribution element or rotor with openings made through the wall of the external distribution element or stator. .
  • Some of the openings made in the stator are large, substantially rectangular windows, two opposite edges of which cooperate with two edges of adjacent grooves in the rotor, one of the grooves communicating with the source of fluid and the other groove communicating with the reservoir.
  • Document FR-A-2 160 548 also provides a hydraulic distributor making it possible to obtain a desired law of variation between the increase in pressure and the relative angle of rotation by circular holes arranged in parallel in the same branch of the circuit. and having different flow sections.
  • the present invention therefore relates to a hydraulic distribution device for a servo-mechanism, in particular for power steering, of the type comprising two fluid distribution elements, cylindrical, coaxial and capable of limited relative rotation about their common axis, on either side of a neutral relative position, these distribution elements comprising openings and cavities defining a fluid circulation circuit connectable between a source of fluid and a fluid reservoir, this circuit comprising two distribution branches arranged in parallel, provided with passages with variable cross-section defined in a cylindrical surface of contacts of said distribution elements and comprising in particular in each branch two types of passages with reversed opening variation directions for any direction of said relative rotation beyond from said neutral relative position, passages of these two types communicating with a pri working pressure of the branch in question, characterized in that the aforementioned variable section passages are all materialized by the partial overlapping of longitudinal grooves dug in a cylindrical surface of one of the distribution elements and of holes with circular contour practiced radially through the other distribution element, and in that passages of the same type are arranged in parallel in
  • the dispensing device 11 essentially comprises a fixed housing 12, provided with connection end pieces such as, for example, the end piece 13 and comprising a bore 16 housing two elements.
  • fluid distribution elements 14 and 15 cylindrical and coaxial, each comprising a sleeve-shaped part.
  • the most internal distribution element 15 is guided in rotation in the sleeve formed by the distribution element 14, the most external while the internal space of the sleeve formed by the distribution element 15 houses a torsion bar 18 connected, by one of its ends, to the distribution element 15 by a pin 19 and, by its other end, to the distribution element 14 by a pin 20.
  • This torsion bar therefore constitutes, in a well known manner, a means of return to the neutral relative position allowing a limited rotation, of a few degrees, of a distribution element relative to the other about their common axis (coincident with that of the bar of twist 18) and on either side of said neutral relative position.
  • the distribution elements also include openings and cavities whose complex arrangement will be described in more detail with reference to Figures 2 to 4, and which define a fluid circulation circuit 26 (see Figure 2) between a source fluid such as a pump 27 and a fluid reservoir 28.
  • the aforementioned openings and cavities cooperate to form passages of variable section operating by covering the cylindrical surfaces in contact 30 and 31 of the distribution elements 14 and 15, respectively during the aforementioned limited relative rotation.
  • the distribution device 11 being more particularly intended for a power steering system, the external sleeve forming the distribution element 14 is extended by an output shaft 35 intended to be coupled, for example, to a rack 36 (see FIG. 2 ) a wheel steering mechanism.
  • This distribution element 14 also called a stator, is guided in rotation in the bore 16 and annular spaces (37, 38, 39, 40) longitudinally adjacent, are individualized between the external surface of the distribution element 14 and the surface of the bore 16, by means of annular seals 44 and 49, to form parts of the fluid circulation circuit 26 and in particular two working pressure taps, merged with the annular spaces 37 and 39 and intended to be connected to the two pressure chambers of a hydraulic assistance motor such as a double-acting cylinder 45 (FIG. 2) linked to the rack 36.
  • the annular spaces 37 and 39 are in communication with the cylinder 45 by means of 'connection ends of the housing 12, not visible in Figure 1, but symbolized by the centerlines 46 and 47, respectively.
  • annular space 38 is connected to the outlet of the pump 27 by a connection end piece of the housing 12 symbolized by the center line 48, the assembly constituting the means for connection to the source of fluid, cited. upper.
  • the space 40 (delimited at one of its ends by the seal 49) communicates with the connection end piece 13 which constitutes the return outlet to the reservoir 28.
  • Radial holes 50 in the element 14 place the space 40 in communication with the internal space 51 of the distribution element 15, in which is housed the torsion bar 18.
  • the distribution element 15, the most internal, is also called rotor because it is intended to be connected by its axial end 55 to the steering column (not shown) of a vehicle.
  • the fluid circulation circuit 26 will now be described with reference to FIGS. 2 to 4.
  • this circuit essentially consists of two parallel branches 56, 57 provided with the above-mentioned variable section passages.
  • the passages of one or the other type will be differentiated by numerical references bearing the indices "a or" b ", respectively.
  • passages 60a, 61a in the branch 56 there are two passages 60a, 61a in the branch 56 arranged in parallel between the annular space 38 for supplying fluid and the pressure tap 37 and two passages 62a, 63a in the branch 57 arranged in parallel between the pressure tap 39 and the annular space 40 returning to the reservoir, (see FIG. 2).
  • passages 60b, 61b in the branch 57 agencies in parallel between the annular space 38 and the pressure tap 39 as well as two passages 62b, 63b, in the branch 56 arranged in parallel between the socket pressure 37 and the annular space 40.
  • each branch 56 or 57 has passages of variable section of the two types (indices “a and“ b ”) mounted in series between the source of fluid (pump 27) and the reservoir 28 and a portion of the circuit between passages of different types communicates with a pressure tap (37, 39) of the branch (56, 57, respectively) considered.
  • passage 64a in the branch 56 and a passage 64b in the branch 57 there are two other passages with variable cross-section which will be referred to below as “high pressure passages", a passage 64a in the branch 56 and a passage 64b in the branch 57.
  • the passage 64a is mounted in series with a restriction flow 65, constant flow section, and the assembly formed by this passage and this restriction is connected between the annular space 38 and the pressure tap 37.
  • the passage 64b is mounted in series with a restriction flow 65, constant flow section, and the assembly formed by this passage and this restriction is connected between the annular space 38 and the pressure tap 39.
  • the passages 64a and 64b are called “passages for high pressures because their complete closure, for a corresponding relative direction of rotation, is determined at an angle for which all other passages of the same type are already closed.
  • passage 64a the complete closure of passage 64a occurs only "after” that of passages 60a, 61a, 62a, 63a, for a given relative direction of rotation and during this final possible range of relative rotation between the distribution elements 14 and 15, the fluid flow rate in branch 56 is essentially determined by the sections of passages 64a and 65. It will be noted that over this range involving relatively high operating pressures, the flow of fluid is completely interrupted between the pressure tap 39 and the annular space 40 while the pressure drop between the annular space 38 and the pressure tap 37 (the pressure of which is very close to that of the reservoir 28 due to the opening of the passages 62b, 63b) is completely ensured by the flow of fluid through passages 64 and 65 connected in series.
  • FIGS. 3 and 4 show how the various passages and flow restrictions constituting the fluid circulation circuit 26 are produced.
  • the distribution element 15, forming a rotor is provided with eight longitudinal grooves 70 hollowed out in its external cylindrical surface 31 and closed at their axial ends. These grooves are regularly angularly offset by 45 ° relative to each other.
  • Four grooves 70a or fluid supply grooves are closed and permanently arranged opposite holes with circular contours 74 of the distribution element 14 which communicate with the annular space 38 connected to the pump 27.
  • Four other grooves 70b or fluid discharge grooves, are arranged alternately with the grooves 70a and pierced with holes 75 establishing communication with the internal space 51 housing the torsion bar 18, that is to say with the reservoir 28 via the evacuation holes 40 and the nozzle 13.
  • the dispensing element 14 only has holes with circular contours 71, 72, 73 to materialize all the passages with aforementioned variable section, operating by partial overlapping of said grooves and said holes.
  • This feature of the invention is advantageous because it eliminates the shaping by electro-erosion of the openings made through the distribution element 14. According to the invention, it is nevertheless possible to adapt the characteristic "Pressure-relative angle of rotation Of the distributor to any law of variation desired by the fact that passages of the same type are arranged in parallel in the same branch 56 or 57 of the circuit 26 with different flow sections at least for a relative range of rotation between the two distribution elements around the neutral relative position. A desired law of variation is thus obtained between the increase in pressure available at one of the pressure taps and the relative angle of rotation in the corresponding direction, by a judicious choice of a combination of openings with sections of different flow, these different flow sections being for example considered in the neutral relative position of the elements of the distributor.
  • the differences in flow section between passages 60, 61 are simply obtained by differences in diameter between the corresponding holes 71 and 72.
  • certain passages of different types of the same branch (60a, 62b) or (61a, 63b) are arranged in pairs and a pair is defined by the cooperation of a hole in the stator 14 (71 or 72, respectively ) with two adjacent grooves 70a, 70b, communicating respectively with the pump 27 and the reservoir 28, said hole being equidistant from the two grooves in the neutral relative position illustrated in particular in FIG. 3.
  • a hole 73 in one of said high-pressure passages cooperates with a groove edge 70a which also materializes the passage of the same type (60a, respectively 60b) of one of the pairs of above passages in cooperation with a hole 71 partially overlapping two adjacent grooves 70a, 70b.
  • the positioning of the holes 73 relative to the grooves 70a is such that the complete closure of the passages 64 is determined at a relative angle of rotation for which all the other passages of the same type are closed, as mentioned previously.
  • the diameter of the holes 73 is significantly smaller than that of the holes 71 and 72 so that they can never communicate with the adjacent grooves 70b.
  • each aforementioned flow restriction 65 is formed in the stator 14 by a tubular portion 78, or ring, of determined interior section, partially closing, over part of its depth, the hole 73 of the passage for high pressures.
  • each branch 56, 57 according to the embodiment of FIGS. 3 and 4 in fact comprises twice the passages with variable sections compared to the schematic representation of FIG. 2.
  • each branch 56 or 57 is provided with two identical series pairs of aforementioned passages and two high pressure passages (64a or 64b), said circular contour holes (71, 72, 73) of the same diameter being diametrically opposite two by two on the cylindrical distribution element 14 which carries them .
  • the holes 71 there are two holes 71, two holes 72, two holes 73 by branches 56 or 57 so that the machining of the stator 14 is essentially composed of extremely simple drilling operations, according to the diameters of the sleeve 14.
  • the holes 74 are also circular in outline and two to two diametrically opposite.
  • the operation of the dispensing valve is as follows. If it is assumed that the user requests the rotor 15 to rotate clockwise, all the passages bearing the index "a will close and all the passages bearing the index" b will open. The diameter of the holes 71 being greater than that of the holes 72, it is the passages 6la of the branch 56 and 63a of the branch 57 which will close completely in the first place. Then, for an additional relative rotation of the two elements of the dispenser, the passages 60a and 62a will be completely closed.
  • the pressure increase at the pressure tap 39 evolves along a predetermined curve as a function of the relative angle of rotation (in particular a substantially parabolic curve) this curve resulting from the choice of the diameters of the holes 71 , 72, and 73 and the particular positioning of the holes 73.
  • all communication between the pressure tap 39 and the reservoir 28 is interrupted so no cavitation in this branch and, in the opposite branch 56, the pressure drop between the annular space 38 connected to the pump 27 and the pressure tapping outlet 37 is completely ensured by the flow of fluid through the passage 64a and the restriction 65 in series with it, as mentioned previously. Cavitation is avoided in this part of the branch 56 by the appearance of a back pressure upstream of the restriction 65, so that the operation remains silent even under these operating conditions at high pressures corresponding in particular to garage maneuvers. of the vehicle equipped with such a power steering system.
  • FIG. 5 The embodiment shown diagrammatically in FIG. 5, in which the structural elements already described bear the same numerical references, is particularly suitable for a dispenser model with reduced axial bulk.
  • grooves 70a communicating through holes 74 made in the stator 15 with the annular space 38 and four fluid evacuation grooves 70b communicating as previously with the reservoir 28.
  • These grooves are distributed in circular symmetry on the external surface of the rotor 14, alternately in two groups G 1 and G 2 each comprising three grooves 70a and two grooves 70b.
  • one of the fluid supply grooves 70a of a group G 1 or G 2 cooperates exclusively with a hole 73 in one of the passages for high pressures (64a or 64b) mentioned above while the other two grooves 70a of this same group cooperate respectively with the two other grooves 70b for evacuating fluid and with the holes 71 and 72 of different diameters, to define the two pairs of passages with variable sections, in a comparable manner to what has been explained with reference to Figure 3.
  • the last two fluid evacuation grooves 70bn, or neutral grooves, do not cooperate with any hole in the stator 15.
  • the arrangement of the grooves in which the height prevails The pressure of the pump and the low pressure of the reservoir, alternating regularly on the surface of the rotor, makes it possible to very significantly reduce the effects of "sticking" of the rotor on the stator.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Servomotors (AREA)

Claims (2)

1. Hydraulische Verteilungseinrichtung für einen Servomechanismus, insbesondere für eine Servolenkung, mit zwei zylindrischen, koaxialen Verteilungselementen, die aus einer relativen Neutralstellung in der einen und anderen Richtung eine begrenzte Relativdrehung um ihre gemeinsame Achse ausführen können, wobei die Verteilungselemente (14, 15) Öffnungen und Hohlräume aufweisen, die einen zwischen einer Strömungsquelle (27) und einem Reservoir (28) anschließbaren Strömungsmittelkreis bilden, wobei der Strömungsmittelkreis zwei parallel geschaltete Zweige (56, 57) aufweist, die mit querschnittsveränderlichen Kanälen (60-64) versehen sind, die in den zylindrischen Berührungsflächen der Verteilungselemente (14, 15) gebildet sind und in jedem Zweig (56, 57) zwei Arten von Kanälen aufweisen, die einen entgegengesetzten Öffnungssinn für jede beliebige Drehrichtung aus der relativen Neutralstellung heraus haben, wobei Kanäle dieser beiden Arten (a, b) mit einem Arbeitsdruckanschluß (37, 39) des betrachteten Zweiges verbunden sind, dadurch gekennzeichnet, daß die besagten querschnittsveränderlichen Kanäle sämtlich durch eine teilweise Überdeckung von längs verlaufenden Nuten (70a, 70b), die in einer zylindrischen Fläche eines (15) der Verteilungselemente ausgearbeitet sind, und kreisförmigen Löchern (71, 72, 73), die radial verlaufend im anderen Verteilungselement (14) eingearbeitet sind, gebildet werden, und daß Kanäle derselben Art (« a » oder « b ») parallel geschaltet im selben Zweig (56, 57) des Strömungsmittelkreises mit unterschiedlichen Strömungsquerschnitten für mindestens eine Relativdrehung zwischen den beiden Verteilungselementen (14, 15) aus der relativen Neutralstellung angeordnet sind, um ein gewünschtes Änderungsgesetz zwischen der zur Verfügung stehenden Druckzunahme an einem der Druckanschlüsse (37, 39) und dem relativen Drehwinkel in dem entsprechenden Drehsinn zu erhalten.
2. Verteilungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß Kanäle unterschiedlicher Art eines selben Zweiges (56, 57) paarweise angeordnet sind und ein Paar durch Zusammenwirken eines der besagten Löcher (71, 72) mit zwei angrenzenden parallelen Nuten (70a, 70b) gebildet wird, von denen die eine (70a) mit Anschlußmitteln (38) der Strömungsmittelquelle und die andere (70b) mit Anschlußmitteln (40) des Strömungsmittelreservoirs (28) in Verbindung steht.
EP81401887A 1980-12-02 1981-11-27 Verteilungseinrichtung, insbesondere für eine Servolenkungsanlage Expired EP0053559B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8025545A FR2495241A1 (fr) 1980-12-02 1980-12-02 Dispositif de distribution, notamment pour systeme de direction assistee
FR8025545 1980-12-02

Publications (2)

Publication Number Publication Date
EP0053559A1 EP0053559A1 (de) 1982-06-09
EP0053559B1 true EP0053559B1 (de) 1984-07-25

Family

ID=9248571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401887A Expired EP0053559B1 (de) 1980-12-02 1981-11-27 Verteilungseinrichtung, insbesondere für eine Servolenkungsanlage

Country Status (7)

Country Link
US (1) US4465099A (de)
EP (1) EP0053559B1 (de)
JP (1) JPS57118962A (de)
AU (1) AU547948B2 (de)
DE (1) DE3165121D1 (de)
ES (1) ES507648A0 (de)
FR (1) FR2495241A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511466B1 (fr) * 1981-08-11 1986-01-17 Dba Distributeur rotatif hydraulique pour servomecanisme
FR2520066A1 (fr) * 1982-01-18 1983-07-22 Dba Distributeur pour servomecanisme hydraulique
FR2576064B1 (fr) * 1985-01-11 1987-03-20 Bendix France Distributeur hydraulique rotatif pour servomecanisme
JP2532079B2 (ja) * 1987-01-30 1996-09-11 日産自動車株式会社 パワ−ステアリング用ロ−タリ制御弁
FR2628485A2 (fr) * 1987-06-18 1989-09-15 Bendix France Distributeur hydraulique rotatif pour servo-mecanisme
US5038878A (en) * 1988-10-28 1991-08-13 Nissan Motor Co., Ltd. Variable assist power steering apparatus
US6058703A (en) * 1998-09-28 2000-05-09 Smith; Richard Fluid valve transmission

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939429A (en) * 1957-10-21 1960-06-07 Germane Corp Rotary valve for power steering mechanism
BE791086A (fr) * 1971-11-16 1973-03-01 Danfoss As Appareil de commande pour systemes hydrostatiques ou hydrauliques
DE2835815C2 (de) * 1978-08-16 1986-09-18 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Drehschieberlenkventil für Hilfskraftlenkungen
DE2843592C3 (de) * 1978-10-06 1981-11-19 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hilfskraftlenkgetriebe
DE2856606C2 (de) * 1978-12-29 1986-04-24 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Drehschieberlenkventil für Hilfskraftlenkungen

Also Published As

Publication number Publication date
AU547948B2 (en) 1985-11-14
EP0053559A1 (de) 1982-06-09
ES8300958A1 (es) 1982-11-01
DE3165121D1 (en) 1984-08-30
ES507648A0 (es) 1982-11-01
US4465099A (en) 1984-08-14
FR2495241B1 (de) 1983-02-18
FR2495241A1 (fr) 1982-06-04
JPS57118962A (en) 1982-07-24
AU7759981A (en) 1982-06-10

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